PCF7936AS 데이터 시트보기 (PDF) - NXP Semiconductors.
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PCF7936AS Datasheet PDF : 33 Pages
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NXP Semiconductors
Security Transponder (HITAG2)
Product Specification
PCF7936AS
Password Mode (ENC = 0)
bit 31
IDE
b31
PSW B
X
not used
TMCF b23
PSW T
bit 0
Page 0
b0 Page 1
Page 2
b0 Page 3
USER 0
USER 1
USER 2
USER 3
MSB
Page 4
Page 5
Page 6
Page 7
LSB
Cipher Mode (ENC = 1)
bit 31
IDE
b31
SK (low)
X
b47 SK (high)
TMCF b23
PSW T
bit 0
Page 0
b0 Page 1
b32 Page 2
b0 Page 3
USER 0
USER 1
USER 2
USER 3
MSB
Figure 4. Transponder Memory Map
Page 4
Page 5
Page 6
Page 7
LSB
Note
1. Locations marked ‘X’ are for device internal use. They
are partly initialized and locked against overwriting
during device manufacturing and are not available for
data storage. Any read operation yields an undefined bit
value.
Pages 0 to 3 of the EEPROM memory are reserved for
transponder configuration and personalization, while
Page 4 to 7 are reserved for user data storage, USER.
According to the selected authorization method, page 1 and
2 do hold a Password, PSW B, (Password mode) or the
Secret Key, SK, (Cipher mode).
7.1.1 Identifier, IDE
The Identifier, IDE, is a factory programmed quasi unique
32 bit pattern that serves the function of a device serial
number (SN) and product type identification (PI). The
Identifier is located in page 0 and supports read access
only, thus cannot be altered.
The product type identification is located in the bits 4 to 7
and factory programmed for all PCF7936AS devices to
1H, as shown in Figure 5.
bit 31
SN 3
MSB
IDE
SN 2
87 43 0
SN 1 PI SN 0
LSB
bit 7 6 5 4
0 0 0 1 PI
Figure 5. Identifier Organization, IDE
The Identifier, IDE, is transmitted in plain and incorporated
in the process of device authentication, thus used by the
on-chip Calculation Unit as well as by the interrogating
system.
7.1.2 Password Basestation, PSW B
The Password Basestation, PSW B, is applicable in
Password mode only (ENC = 0). The Password
Basestation is a 32 bit pattern, which typically is initialized
and subsequently locked by the customer during device
personalization. The Password Basestation is located in
page 1, see Figure 4.
During the process to identify the basestation towards the
transponder, the transponder verifies the password
received by the basestation with the password stored in
PSW B. If both match each other, the transponder assumes
successful identification of the basestation and the
authentication sequence is continued, otherwise it is
terminated. For details refer to section 7.3.1,
START_AUTH command.
The Password Basestation may be assigned any value that
is considered useful by the application. The PSW B can be
protected against reading and writing by setting the lock bit
SKL, see section 7.1.4
NXP initializes the Password Basestation with a common
Transport Key value as specified (see section 8), in order
to enable initial device access. Since the corresponding
lock bit is not set, the PSW B Transport Key value and
device configuration can be read and modified at any time
as desired.
2010 May 04
8
CONFIDENTIAL
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